\1 works inside the regex where the capture group was defined. $1 works everywhere else, i.e. in a replacement of a substitution. $1 in a regex refers to a previously matched regex (which explains the uninitialized warnings).
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
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Thanks for the explanation choroba. It always helps to know the "why" behind the way things work. It makes it easier to remember in the future when a similar situation arises. Perl Monks are the best!
"It's not how hard you work, it's how much you get done."
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